class A {
    double f(double x, double y) {
        return x + y;
    }
}

class B extends A {
    double f(int x, int y) {
        return x * y;
    }
}

public class E {
    public static void main(String args[]) {
        B b = new B();
        System.out.println(b.f(3, 5));
        System.out.println(b.f(3.0, 5.0));
    }
}
